jawablah soal ini dengan benar

Saya coba yaaa.
P = {-2,-1,0,1,2,3,4,5}.
Q = {-1,0,1,2,3,4,5,6,7,8}.
R = {-2,-1,0,1,2,3,4,5,6,7,8,9}.

jadi.
P irisan Q irisan R.
{-1,0,1,2,3,4,5} irisan {-2,-1,0,1,2,3,4,5,6,7,8,9}.
{-1,0,1,2,3,4,5}.

cmiiw. laporkan aj.

S={1,2,3,4,5,6...}
P={-2,-1,0,1,2,3,4,5}
Q={-1,0,1,2,3,4,5,6,7,8}
R={-2,-1,0,1,2,3,4,5,6,7,8,9}

P irisan Q={-2,-1,0,1,2,3,4,5}irisan {-1,0,1,2,3,4,5,6,7,8}={-1,0,1,2,3,4,5}

diiris lagi
{-1,0,1,2,3,4,5} irisan {-2,-1,0,1,2,3,4,5,6,7,8,9}={-1,0,1,2,3,4,5}